Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 6: Nuclear Astrophysics I
HK 6.5: Talk
Monday, March 10, 2025, 16:15–16:30, SR 0.03 Erw. Physik
Neutrino opacities in the NJL model with color superconductivity — •Marco Hofmann1, Alexander Haber2, Liam Brodie3, Mark Alford3, Hosein Gholami1, and Michael Buballa1 — 1Technische Universität Darmstadt, Germany — 2University of Southampton, United Kingdom — 3Washington University in St. Louis, Missouri, USA
Neutrino transport plays a critical role in the evolution of neutron star mergers and the cooling of neutron stars. In this work, the quark core in a hybrid star is modeled with a three-flavor NJL-type model that allows for color-superconductivity (arXiv:2408.06704). We calculate the direct Urca neutrino opacities of quark matter in the unpaired and in the two-flavor superconducting (2SC) phase. At low temperatures, the contribution of the gapped quarks can be neglected and we show how the self-consistently calculated quark masses determine the density-window in which the charged-current direct Urca process is kinematically allowed. While neutrino absorption by down quarks is kinematically forbidden at zero temperature, the process with strange quarks is kinematically allowed.
Keywords: neutrino transport; color superconductivity; neutron stars; dense quark matter